diff --git a/packages/docusaurus/src/webpack/client.ts b/packages/docusaurus/src/webpack/client.ts
index 56bbb669d4..66e32fae36 100644
--- a/packages/docusaurus/src/webpack/client.ts
+++ b/packages/docusaurus/src/webpack/client.ts
@@ -117,6 +117,7 @@ export async function createStartClientConfig({
headTags,
preBodyTags,
postBodyTags,
+ lang: props.i18n.localeConfigs[props.i18n.currentLocale]!.htmlLang,
}),
],
},
diff --git a/packages/docusaurus/src/webpack/templates/dev.html.template.ejs b/packages/docusaurus/src/webpack/templates/dev.html.template.ejs
index ee6270b0e4..3827683355 100644
--- a/packages/docusaurus/src/webpack/templates/dev.html.template.ejs
+++ b/packages/docusaurus/src/webpack/templates/dev.html.template.ejs
@@ -1,5 +1,5 @@
-
+